Synchronization of estrus in embryo transfer recipients receiving demi-embryos with Syncro-Mate B or estrumate

King, M.E.; Odde, K. G.; LeFever, D.G.; Brown, Larry N.; Neubauer, C.

doi:10.1016/0093-691x(86)90026-9

Cited by 16 publications

(6 citation statements)

References 21 publications

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“…This is in agreement with Miksch et al (1978), but in contrast to earlier reports indicating that estrus synchronization rate was higher in heifers than in cows following progestagen treatments in combination with PGF given the day before or at the end of treatment (Heersche et al 1979;Beal and Good 1986;Brown et al 1986;Whittier et al 1986). In contrast to previous reports (Burfening et al 1978;King et al 1982;Wenkoff 1987), interval from induction to onset of estrus was similar in heifers and cows in the Control and SMB-PGF groups.…”

contrasting

confidence: 57%

Effects of Synchro-Mate B and prostaglandin F2α on estrus synchronization and fertility in beef cattle

Twagiramungu¹,

Dufour²,

Guilbault³

et al. 1992

Can. J. Anim. Sci.

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The efficiency and precision of estrus synchronization and fertility were evaluated after prostaglandin F2α (PGF) treatment with or without pretreatment with Synchro-Mate B (SMB) in beef cattle. In the treatment group (SMB-PGF, n = 109), postpartum suckled (n = 53), and nonsuckled (n = 32) cows and virgin heifers (n = 24) received SMB for 9 d and PGF 72 h before implant withdrawal. In the control group (Control, n = 111), postpartum suckled (n = 51), and nonsuckled (n = 36) cows and virgin heifers (n = 24) were observed for estrus and bred at spontaneous estrus over a 6-d period. Those not detected in estrus were then injected with PGF and bred at induced estrus over an additional 6-d period. Synchronization rate at induced estrus was higher (95.4 vs. 84.2%, P < 0.01) and time interval from induction to onset of estrus was shorter (37.0 ± 2.1 h vs. 56.7 ± 2.8 h, P < 0.01) in the SMB-PGF group than after PGF in the Control group. Whether the time around the mean interval to estrus (precision) was ± 6, ± 12, ± 18 or ± 24 h, the synchronization rate was always higher (P < 0.01) in the SMB-PGF than in the Control group. Heifers and cows in both groups had similar estrus synchronization rates and mean intervals to estrus. Suckled and nonsuckled cows behaved similarly in their estrus response within the SMB-PGF group but not in the Control group. Our results indicate that administration of PGF 72 h before SMB implant withdrawal could be a very efficient and precise synchronization method without a negative effect on fertility in beef cattle. Key words: Estrus synchronization, beef cattle, Synchro-Mate B, prostaglandin F2α

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contrasting

confidence: 57%

Effects of Synchro-Mate B and prostaglandin F2α on estrus synchronization and fertility in beef cattle

Twagiramungu¹,

Dufour²,

Guilbault³

et al. 1992

Can. J. Anim. Sci.

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“…However, Pace and Sullivan (1980) reported no advantage in pregnancy rate for cows treated with Syncro-Mate B with calf removal compared with no calf removal in a study utilizing 2,015 postpartum beef cows from 10 ranches. Similarly, Brown et al (1986) showed no advantage for calf removal compared with no calf removal after Syncro-Mate B treatment. Cows in both these studies were bred according to estrus; this may explain some of the difference between these studies and that of Kiser et al (1980).…”

Section: Progestogen-estrogen Combinationsmentioning

confidence: 89%

“…When beef heifers were treated with a 7-d norgestomet implant and injected with PGF2a on d 6 or 7 after implantation, 93% showed estrus within 5 d and 62% of these conceived, which was similar to a 60% fxstservice conception rate for controls (Heersche et al, 1979). Combined with an injection of alfaprostol at implant removal, a 9-d norgestomet implant was as effective as Syncro-Mate B in postpartum beef cows (Bed et al, 1984;Brown et al, 1986). Whittier et aI.…”

Section: Progestogen-prostaglandin Combinationsmentioning

confidence: 95%

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A review of synchronization of estrus in postpartum cattle.

Odde

1990

Journal of Animal Science

266

124

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Estrus has been synchronized in cattle with progestogens, prostaglandins (prostaglandin F2 alpha and its analogues), progestogen-estrogen combinations and progestogen-prostaglandin combinations. Progestogens administered for 14 to 20 d are effective in synchronizing estrus; however, fertility at the synchronized estrus is subnormal. Duration of progestogen treatment can be reduced by combining it with an estrogen. Syncro-Mate B is a progestogen-estrogen combination that results in a tightly synchronized estrous response. Prostaglandins can be used in double- or single-injection programs. Fertility of the estrus after prostaglandin treatment is similar to that of controls. Estrus also has been synchronized effectively by combining a 5- to 9-d progestogen treatment with prostaglandin at or near the end of treatment. When prostaglandin is used alone, cattle in the late stages of the luteal phase (d 11 to 15 of the estrous cycle) at the time of prostaglandin injection have a higher estrous response and may be more fertile than those injected with prostaglandin in the early part (d 6 to 9) of the luteal phase. More recently, a 14-d progestogen treatment has been combined with a prostaglandin injection given 16 to 18 d after progestogen withdrawal. This system places cattle in the late luteal phase of the estrous cycle at the time of prostaglandin injection and has resulted in an estrus with greater fertility than that immediately following progestogen treatment.

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“…É possível atribuir também à compensação da disfunção luteal decorrente da quantidade de progesterona liberada pelo implante insuficiente para 94 promover uma gestação num primeiro momento, porém, adequada para promover a retomada da ciclicidade como sugerida por King et al (1986), ou ainda pela insuficiente produção do hormônio luteinizante após a retirada do implante, conforme referiram-se Hixon et al (1981), bem como em decorrência da combinação entre esses e outros fatores, como relatado por Jöchile (1993). Além disso, durante a estação de monta, as vacas estavam submetidas à pastagens de boa qualidade, o que contribuiu para melhora do balanço energético e ECC, consequentemente, saírem do anestro nutricional e ficarem prenhas.…”

Section: Taxa De Prenhezunclassified

Avaliação de estratégias para aumentar a fertilidade de fêmeas nelore submetidas a protocolos de sincronização

Biehl¹,

Pires²

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Synchronization of estrus in embryo transfer recipients receiving demi-embryos with Syncro-Mate B or estrumate

Cited by 16 publications

References 21 publications

Effects of Synchro-Mate B and prostaglandin F2α on estrus synchronization and fertility in beef cattle

Effects of Synchro-Mate B and prostaglandin F2α on estrus synchronization and fertility in beef cattle

A review of synchronization of estrus in postpartum cattle.

Avaliação de estratégias para aumentar a fertilidade de fêmeas nelore submetidas a protocolos de sincronização

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